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DISPOSITIONS AND ACQUISITIONS (FCX Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 21, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Other current assets $ 422   $ 286
Property, plant, equipment and mine development costs, net 28,010   22,994
Noncontrolling interests (8,094)   (3,319)
Capital in excess of par value $ 26,013   $ 26,751
PT-FI | Rio Tinto Share In Joint Venture      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash   $ 458  
Other current assets   23  
Liabilities other than taxes   (77)  
Deferred income taxes, net   (788)  
Noncontrolling interests   (4,762)  
Capital in excess of par value   531  
PT-FI | Rio Tinto Share In Joint Venture | Mineral reserves      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant, equipment and mine development costs, net   3,056  
PT-FI | Rio Tinto Share In Joint Venture | Mine development, infrastructure and other      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant, equipment and mine development costs, net   $ 1,559